After the initial report at 7:35 p.m. Tuesday, police locked down Concord High School and all remaining students and staff were evacuated.

Police found the possible suspect at his home. He was arrested and charged with criminal threatening.

After a follow-up interview, police determined that the girl lied about the events at the school. Police said the incident did not occur as originally reported.

Police then released the possible suspect from custody. He faces no charges.

The student who reported the threat faces possible charges for filing a false police report and creating a public disturbance. The motive for the false report was still being investigated, police said.